For intentionally added collateral, the first asset is valued at its own date of possession and the additional asset at the date it is separately received. The same existing debt is apportioned according to these relevant values.
The redemption-date valuation used for surviving natural increase is not simply copied here. Deliberately added security is an independent pledged object, with its own date of receipt.
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Valuation of intentionally added security
Kitab al-Rahn: Storage Costs, Growth and Additional Collateral
For intentionally added collateral, the first asset is valued at its own date of possession and the additional asset at the date it is separately received. The same existing debt is apportioned according to these relevant values.
The redemption-date valuation used for surviving natural increase is not simply copied here. Deliberately added security is an independent pledged object, with its own date of receipt.